Magnetic fluid brake and support therefor



Sept. 28, 1954 F. BACHMAN MAGNETIC FLUID BRAKE AND SUPPORT THEREFORFiled July 22, 1949 s Sheets-Sheet 1 IN V EN TOR.

Sept. 28, 1954 F. E. BACHMAN MAGNETIC FLUID BRAKE AND SUPPORT THEREFORFiled July 22, 1949 8 Sheets-Sheet 2 INVENTOR.

fled jacfizzzazzz W I Q? Sept. 28, 1954 F. E. BACHMAN 2,690,241

MAGNETIC FLUID BRAKE AND SUPPORT THEREFOR Filed July 22, 1949 8Sheets-Sheet 3 50 K: m Y J 5 46 INVENTOR.

7 yif ed fljQc/zzau 13 4314 I /4 Sept. 28, 1954 Filed July 22. 1949 F.E. BACHMAN MAGNETIC FLUID BRAKE AND SUPPORT THEREFOR 8 Sheets-Sheet 4INVENTOR.

FecZ flea/572972 F. E. BACHMAN MAGNETIC FLUID BRAKE AND SUPPORT THEREFORFiled July 22, 1949 Sept. 28, 1954 8 Sh'ets-Sheet 5 INVENTOR. 776djac/fzzaia Sept. 28, 1954 F. E. BACHMAN 2,690,241

MAGNETIC FLUID BRAKE AND SUPPORT THEREFOR Filed July 22. 1949 8Sheets-Sheet 6 IN V EN TOR.

Sept. 28, 1954 F. E. BACHMAN MAGNETIC FLUID BRAKE AND SUPPORT THEREFORFiled July 22, 1949 8 Sheets-Sheet 7 INVEN TOR. fied- Ijaczm p 28, 1954F. E. BACHMAN 2,690,241

MAGNETIC FLUID BRAKE AND SUPPORT THEREFbR Filed July 22. 1949 8Sheets-Sheet 8 1 If I .1 A

Patented Sept. 28, 1954 more MAGNETIC FLUID BRAKE AND SUPPORT THEREFORFred Edward Bachman, St. Louis, Mo., assignor to American SteelFoundries, Chicago, 111., a corporation of New Jersey Application July22', 1949, Serial No. 106,258

'7 Claims.

This invention relates to magnetic fluid brakes wherein the brake rotorand stator means are coupled during a braking operation by magnetizedparticles in a slurry or mixture of such particles and a liquid such'asoil, and more particularly to such a brake adapted to withstand theconditions of railway service and to dissipate the great heat developedin braking a railway car.

A general object of the invention is to devise a magnetic iiuid brakewhich may be readily assembled and disassembled and which is capable oflong life in railway service.

Another object of the invention is to remove heat from the brake bycirculating the magnetizable brake fiuid through a heat exchanger orradiator and through a housing containing the brake rotor and statorparts. 'In certain types of service where the magnetic fluid becomessubstantially solid in a magnetic field during a brake application, thefluid may be circulated between brake applications and in other types ofservice where the magnetic particles which couple the rotor and statorsurfaces in a magnetic field are in such concentration as not to preventthe fiow of the nonmagnetic liquid in which the particles are mixed orsuspended, this liquid may be circulated during a brake application toremove heat from the brake.

A further object of the invention is to devise an arrangement wherein asealed housing contains rotor and stator plates defining a labyrinthianpassage for the flow of brake fluid through the housing as abovedescribed.

Another object of the invention is to devise a segmental brake rotorhousing which may be readily sealed to a stator support sleeved withinthe housing.

Still another object of the invention is to provicie a novel statormounting wherein the stator plates are connected to a coil housingmounted on the stator support, said housing containing one or moreelectromagnetic coils and having external stator surfaces adapted tocooperate with rotor surfaces of the rotor housing to frictionallyresist rotation thereof when the coils are energized to produce amagnetic field causing the magnetizable brake particles of the brakefluid to form chains connecting the rotor and stator surfaces.

The foregoing and other objects and advantages of the invention willbecome apparent from a consideration of the following specification andthe accompanying drawings, wherein:

Figure 1 is a fragmentary top plan view of a railway car truck, shown inphantom lines, and a preferred embodiment of the novel brake appliedthereto;

Figure 2 is a side elevational View of the structure shown in Figure 1,with the truck frame supporting springs removed to clarify theillustration of the brake parts;

Figure 3 is an end view of the structure shown in Figure 1;

Figure 4 is a sectional view on the line E -t of Figure 2;

Figure 5 is a sectional view on the line 5--5 of Figure 1;.

Figure 6 is a sectional view on the line 56 of Figure 4;

Figure '7 is a fragmentary sectional view on the line 1-"! of Figure 2;

Figure 8 is a side elevational View of a truck having another embodimentof the novel brake applied thereto;

Figure 9 is a fragmentary end View of the structure shown in Figure 8,partly in section on the line 9-$ thereof;

Figure 10 is a sectional view on the line ill-4 B of Figure 9;

Figure 11 is a fragmentary sectional view on the line HH of Figure 8;

Figures 12 and 13 show a modification of the embodiment of Figures 8 to11, Figure 12 being a fragmentary sectional view corresponding to thatof Figure 9, and Figure 13 being a sectional View on the line !3i3 ofFigure 12;

Figure 14 is a side elevational view of a truck and another embodimentof the novel brake applied thereto; v

Figure 15 is an end view of the structure shown in Figure 14, partly insection on the line iii-45 thereof; 7

Figures 16, 16A and 16B are fragmentary, enlarged views of the statorsupport, Figure 16 being a fragmentary top plan view of the torqueconnection between the truck frame and stator support shown in Figure15, Figure 16A being an outboard elevational View of the stator support,and Figure 163 being an inboard elevational view thereof;

Figures 17 to 19 illustrate a modification of the embodiment shown inFigures 14 to 16, Figure 17 being a sectional view taken in the radialplane indicated by the line l'lll of Figure 18, Figure 18 being afragmentary side elevational view taken from the inboard side of thebrake structure from the left of Figure 17, with the inboard rotorhousing segment removed, the left half of Figure 18 being shown insection on the line l8|8 of Figure 17; and Figure 19 being a sectionalview through the brake stator and coil housing support taken in a radialplane through a passage for an electrical lead.

Referring first to the embodiment of Figures 1 to 7, the novel brake isillustrated as applied to a conventional railway car truck including atruck frame 2 having side rails 4, an end rail (3 at each extremity ofthe frame, and a transom 8 adjacent each end rail.

Each side rail 4 is formed adjacent each end thereof with spacedpedestals 9 (Figure 2) adapted for guiding engagement with a journal boxS of a wheel and axle assembly 12 having spaced wheels l4 and an axleit. Each box is adapted to support in the usual manner one end of anequalizer I8 from which the frame 2 is supported in the usual manner bysprings (not shown).

A brake support generally designated 20, comprises a transverse beam 2|connected to the transom 3 by spaced brackets 22, each containing anannular pad 24 of resilient material such as rubber surrounding the beamand having an annular metallic bushing 26 clamped in the bracket. Thebeam 2| is provided at each end thereof with a stator support or torquearm 28 and a guide arm 33 having substantially identical hubs 32 and 35,respectively, sleeved on the beam and secured thereto as by set screws36 (Figure 1), the hubs being connected by a pin or key 38 for movementin unison as the truck frame 2 moves with respect to the wheel and axleassembly 12 under service conditions due to irregularity in the track orother causes well known to those skilled in the art.

Thus it will be understood that this arrangement accommodates rotativeadjustment of the hubs 32 and 3 on the beam 2l which is substantiallycylindrical in form as best seen in Figure 2. The novel arrangement alsoaccommodates adjustment of the hubs 32 and 34 lengthwise of the beamwithout disassembly of the pin 38 inasmuch as this pin is arranged inparallel relationship to the beam and is received within complementaryopenings of the hubs, as shown in Figures 1 and 2.

Each guide arm 30, as best seen in Figures 1 to 4, comprises a hub orjournal 3! slidably journaled within an annular groove 40 (Figure 4) inthe associated journal box I i) for movement concentric with therotational axis of the assembly l2 as the frame 2 moves vertically withrespect thereto.

Each torque arm 28, as best seen in Figure 1, is connected to a statorring 42, which, as shown in Figures 4 and '7, is keyed by splines 44 toa ring 46 press-fitted thereon. The ring 46 comprises an outboard flange48 affording a seat for an annular stator plate 50, and the flange isbolted at 52 to another stator plate 54. A pair of spacer rings 56 and58 and an intermediate coil housing 60 and cover plate 62 therefor areclamped between the plates 50 and 54.

The housing 60 contains electromagnetic means, somewhat diagrammaticallyillustrated for the sake of clarity in the form of a plurality ofelectromagnetic coils 64 to which electrical current is supplied by oneor more leads 68 extend ing through a passage 67 (Figure 7) in the rings42 and 46. Preferably the coils 64 are connected in series to aconventional voltage supply (not shown) by two leads 66, one of theleads being connected to the coil at one end of the series and the otherbeing connected to the coil at the other end of the series. It will beunderstood, however, that one lead 63 will suffice, if the coil at theopposite end of the series is grounded to the torque arm 28, with oneterminal of the voltage supply similarly grounded and the other terminalconnected to the lead b6. Furthermore, if desired, the coils 64 may bearranged in parallel with two leads 66 for each coil or one lead foreach coil, with the latter grounded as above described through thetorque arm 23.

The stator plates 50 and 5d and coil housing 60 are contained within arotor housing generally designated 63 and comprising an inboard annularplate or segment 70 connected to a hub 14 which is secured as by studs'56 to the adjacent wheel I4. The plate it is removably secured as bystuds 18 to an inboard plate 8%), and a ring 82 is clamped between saidplates, the ring being formed with radial heat radiating fins 84, andthe plates H1 and 8E! being formed with radial heat radiating fins 8Eand 83 respectively. Rotor rings or plates and 92 are press fitted inthe housing ring 82 and are connected there" to by splines 94 (Figure6).

The housing ts is provided with fluid sealing rings 96 and 98, and theinterior of the housing is adapted to form a chamber or container for abody of magnetizable fluid such as for example a slurry of oil andparticles of iron in its elemental state or in magnetizable compounds oralloys thereof.

This fluid, upon energization of the coils during a brake application,is adapted to frictionally couple the rotor plates ill], 92, preferablyformed of a magnetizable metal such as iron, to the stator plates 50, 54and to the stator coil housing 60 and cover plate 62 which are alsopreferably formed of a magnetizable metal. Heat developed during such abrake application is radiated by the fins 84, B6 and 8&2; and betweenbrake applications, or during such applications where the slurry is ofsuitable consistency, the slurry may be circulated through the rotorhousing 68 by an inlet line 99 (Figure 4) connected 0 to an inletpassage I09 at the upper side of the stator support member 42, and by anoutlet passage l02 (Figure '7) through said member at the lower sidethereof, connected to an outlet line 99a (Figure 2).

It may be noted that the inlet passage use is connected to the housing68 at the outboard side thereof and the outlet passage M2 is connectedto the inboard side of the housing 68, the rotor plates 10, 80, 90 and92 being spaced from the stator plates 50 and 54 and from the statorcoil housing 60 and cover plate 62 and also from the stator spacers 56,58 to afford a labyrinthian between the inboard and outboard sides ofthe rotor housing 68, whereby the brake fluid may be circulatedtherethrough and may be passed through a conventional heat exchanger orradiator (not shown) to cool the fluid which may then be returned to theinlet passage not. In this manner heat developed during a braking application may be quickly and efiiciently removed from the brakestructure within the housing 63.

Another feature of the invention is the manner in which the torque arms28 transmit braking torque to the beam 2| and are spaced from and keyedto the guide arms 36), which mainta n concentricity between the rotorand stator parts of the brake, thereby simplifying the construction ofthe device by eliminating the necessity of providing torque arms withcomplicated and expensive hearings to maintain concentricity.

Referring now to the embodiment of Figures 8 to 11,'the brake parts areentirely supported by unsprung parts of the truck, which are identifiedby numerals corresponding to those of Figures 1 to 7; and it may benoted that in Figure 8, the springs which support the frame 2 from theequalizer I are diagrammatically shown at H0 and a conventionalequalizer spring seat II2 is also shown, inasmuch as the brake parts arenot obscured by the springs III) and seat H2 in this modification.

In this modification, the outboard end of the journal box I0 is securedas by welding to a hub II3 of a torque arm II'4 having one end thereofanchored as by a bolt and nut assembly H6 to the equalizer I8, saidassembly IIS also affording a convenient connection between theequalizer I8 and spring seat I I2.

The inboard end of the journal box I0 is connected as by studs IIB to astator support hub or ring I having a press fit within a coil housingI22, which is provided with a cover plate I24, the ring I20 being insplined torque transmitting engagement with the housing at I26 and withthe plate at I28. The outer perimeter of the housing I22 supports aplurality of annular stator plates I 30 in splined engagement with thehousing as at I32 (Figure 10), said plates being separated by spacerrings I34 and being clamped against a flange I36 of the housing I22 by aclamping plate I38 and screws I40 which also secure the cover plate I24to the housing I22.

The rotor housing I4I of the modification cornprises an inboard plate orsegment I42 having an axial flange I44 clamped to an outboard segmentI46 by studs I48 which secure the segment I 42 to the wheel I4. Theflange I44 and segment I46 are provided with radial heat radiating finsI50 and I52 respectively.

An annular sealing ring I54 is provided between the segment I46 and theflange I44 and sealing rings I56 and I58 are provided between the statorsupport I20 and flanges I60 and IfiI of the segments I42 and I45,respectively, thereby providing a sealed rotor housing or casing IdIsurrounding the above-described stator structure.

The inner perimeter of the flange I 44 is afiorded a splined connectionas at I62 with a plurality of rotor plates I64 and spacers I56 clampedbetween the segments I42 and I40, and the rotor plates as best seen inFigure 9 are alternately arranged in spaced relationship with the statorplates I30, to define therewith a la'byrinthian flow passage.

To aiforcl circulation of the magnetizable brake fluid through thehousing I4I, an inlet line I68 is connected as seen in Figure 9 to theinboard side of the housing through a port I10 in the stator supportI20, and an outlet line H2 is connected to the outboard side of thehousing I4I through an outlet .port or passage I14 in the support I20.During circulation of the brake fluid, the latter flows into the inletport I10 and radially outwardly therefrom through aligned openings I16and I70 in the stator and rotor plates I30 and IE4 arranged in sets atintervals around the axis of the axle I6, one set of said openings beingseen at the top of Figure 9. Fluid also flows through the labyrinthianpassage between the rotor and stator plates and through ports I80 in theend spacers I66 and chambers I84 (Figures 9 and 10) in the flange I44.

Figure 11 shows the manner in which the s'tato support I20 is formedwith a passage I86 for a lead I88 connected to the coil housing I22 asin the previously'described' embodiment, said hous- 6. ing containingone or more coils indicated at I90, which coils may be arranged inseries with one or two leads I 28 for the series or arranged in parallel with one or two leads for each coil, as in the previouslydescribed embodiment.

Figures 12 and 13 show a modification of the device shown in Figures 8to 11 and corresponding parts are identified by corresponding numerals,the principal difference being the mounting of the stator plates I 30and the annular coil housing I22 and cover plate I24 which are clampedby studs IOI on a sleeve I92 between the outboard edge thereof and aflange I04 at the inboard end of the sleeve I92, which is press-fittedon and splined at I26 (Figure 12) to the stator support ring I20. Alsoin this modification the rotor plates I are clamp-ed between shouldersI08 and 200 of the rotor housing segments I46 and I42, a spacer ring 202being interposed between the rotor plates. The rotor plates and spacerare splined as at 204 to the flange I44 of the inboard segment I42 or"the housing I4I. As best seen in Figure 12, the magnetiza-ble brakefluid is circulated through an inlet pipe I68 and inlet port I'ie of thestator support to the inboard side of the housing IM, and the fluidflows through openings HE and I'IB in the stator plates I30, and rotorplates I 54 respectively and through ports I80 in the spacer ring 222and ports I84 of the flange I44 to the inboard side of the housing andoutwardly therefrom by an outlet pipe (not shown) as in the embodimentof Figures 8 to 11.

Figures 14 to 16 show another embodiment of the device wherein the truckframe 2, equalizer I8, springs lit and parts of the wheel and axleassembly I2 are identified by the numerals used in connection with thepreceding embodiments.

In Figures 14 to 16, the stator support comprises a hub 220 mounted onthe inboard side of each journal box I0 as by screws 22L The hub isformed with spaced arms 222 diverging therefrom and provided at theirupper ends with brackets 22d receiving transverse tie rods or bars 226extending ransversely across the truci: for connection to the arms 222associated with the journal box It at the other end of the wheel andaxle assembly, only one box I0 and associated arms being shown for thesake of simplicity.

The arms 222 of each box I0 are confine-d :between torque lugs or stops228 on the inboard surface of the truck frame side rail 4 to transmitbraking torque through said stops to the frame 2.

A stator support bar 230 is removably secured as by screws 232 to thearms 222 and as best seen in Figures 14 and 15, the bar 230 is formedwith a pair of depending legs 234 eonverging toward and connected to astator support ring 23% (Figure 15) having an annular coil housing 238pressfitted and splined thereon as at 245 (Figure 15). The statorsup-port ring 235 is formed with one or more lead passages 242 for oneor more leads 24 connected to the coils diagrammatically shown at 246,as in the previously described embodiments.

The outboard side of the coil-housing 238 is provided with a radialflange 248 having a plurality of axially tapered flanges 250 extendinginboardly therefrom, said flanges being alternately arranged with andspaced from similar flanges 25I on an inboard segment or plate 252 of arotor housing 254, said plate being connected to a hub 256 and to thewheel I4 as by studs 258.

The housing 254 also comprises an inboard segment or plate 260 and aring 262-clamped by studs 259 between the plates 252 and 26! at theirouter perimeters, the ring 262 and plates being provided with radialheat radiating fins 264. Sealing rings 266 and 268 are clamped betweenthe ring 262 and the plates 269 and 252 respectively. A sealing ring 270is provided between the outboard plate 260 and the stator support ring236, and a sealing ring 212 is provided between the inboard plate 252and the inner perimeter of a flanged cover plate 274 at the inboard sideof the coil housing 248.

Thus the rotor housing 25 provides a sealed chamber or receptacletherewithin for the circulation of magnetizable brake fluid throughinlet and outlet passages (not shown) of the stator ring 236, as in thepreviously described embodiments. The fluid flows from the outboard sideof the housing 254 through ports 21% in the flange 260 and through thespace between the outer flange 25B and the ring 262 and thence throughannular space between the flanges 259 and 251 to the inboard side of thehousing. As in the previously described embodiments, the inlet passage(not shown) of the stator support ring 236 is connected at approximatelythe top thereof to the outboard side of the housing 255, and the outletpassage (not shown) is disposed at approximately the bottom of the ring236 and is connected to the inboard side of the housing 256.

Figures 17 to 19 show a modification of the brake arrangement of Figures14 to 16, together with a flow diagram in Figure 18 of a conventionalfiuid circulating and cooling system which may be used in conjunctionwith all of the preceding embodiments and modifications thereof. Partsof the structure shown in Figures 17 to 19 are identified by the samenumerals as those applied to corresponding parts of Figures 1a to 16,the principal differences being the mounting of the coil housing and therotor and stator plates as hereinafter described.

As clearly shown in Figure 17, an annular coil housing 26! and coverplate 263 are secured to gether by studs or screws 253a and are sleevedover and splined at 265 to the annular stator support ring 236 which issleeved within the rotor housing 254 and is sealed thereto by inboardand outboard sealing rings 2H and 213.

A plurality of stator plates 215 and spacers 211 are sleeved over thehousing 26! and are splined thereto as at 21'! (Figure 18). These platesand spacers are snugly confined against each other and against a flange21 of the housing 2M by an annular washer 239 secured by the studs 263a.

A plurality of rotor plates 282 and spacers tit-i are compressed in astack between the rotor housing segments 252 and 26B and are splined tothe housing ring 262 as at 2M (Figure 18). The rotor plates 282 areinterleaved with the stator plates 215 and are spaced therefrom todefine a labyrinthian flow passage, and the plates H and 282 are alsoprovided with radially overlapping ports 2% and 288 respectively, saidpassage and ports accommodating flow of the brake fluid through thehousing by an inlet line 2% and an outlet line 292 connectedrespectively to a pump 29! (Figure 18) and a heat-exchanger or radiator29%, the suction side of the pump being connected to the radiator toform a closed circuit for forcing brake fluid through the rotor housing255 and then through the radiator 298 to dissipate the heat developedduring a braking operation.

The inlet line 290, as best seen in Figure 17, is connected to theoutboard side of the rotor housing 254 and the outlet line 292, as inthe previously described embodiments, is connected to the inboard sideof the rotor housing 25d, whereby fluid flowing between said linespasses through the ports 2%, 283 and the labyrinthian flow passagedefined by the rotor and stator plates 282 and 212.

Thus it will be understood that I have devised a novel brake wherein abrake fluid containing magnetic particles is subjected to a mag neticfield between rotor and stator surfaces which in all of theabove-described embodiments and modifications are preferably formed ofmagnetizable material to adhere to said particles which when magnetizedform chains between the rotor and stator surfaces, thereby frictionallyresisting rotation of the rotor surfaces. Furthermore, the fluid and theparticles may be circulated in all embodiments through a heat exchangeror radiator between brake applications, and if the concentration of theparticles within the fluid is such as to permit flow of fluid throughthe housing when the brake is applied, the fiuid may be circulatedduring a brake application. The invention also comprehends a novelsupport structure particularly adapted for application to modern railwaycar trucks without disturbing the truck parts during assembly anddisassembly of the brake to service the latter.

I claim:

1. In a brake arrangement for a railway car truck having a truckstructure and a supporting wheel and axle assembly including an axle anda wheel;-the combination of an annular rotor housing encircling the axleand containing and magnetizable particles suspended therein, readilyremovable means connecting the housing to said wheel, said housingcomprising a plurality of separable segments and readily removable meansfor interconnecting said segments, an annular stator support encirclingthe axle and sleeved within said housing in substantially fluid tightengagement therewith, a support ring in said housing sleeved over saidstator support and splined thereto against relative rotation,electro-magnetic means housed in said ring and encircling the axle fordeveloping a magnetic field in the housing, a plurality of magnetizablestator rings carried by said support ring, a plurality of magnetizablerotor rings carried by the housing and interleaved with the stator ringsin spaced relationship thereto there by defining a fluid passage betweensaid rotor and stator rings, said passage communicating with the housingat the inboard and outboard sides of said rings, inlet and outlet portsextend ing through the stator support and the support ring, one of theports being connected to the inboard side of the housing and the otherport being connected to the outboard side of the housing, and a torqueconnection between said stator support and said truck structure.

2. In a brake arrangement for a railway car truck having a truck frameresiliently supported from a wheel and axle assembly including an axleand spaced wheels; the combination of a substantially cylindrical beamresiliently connected to the structure, annular rotor housings securedto respective wheels and encircling the axis or" said assembly, annularstator supports sleeved within respective housings, brake means carriedby said supports for decelerating said housings, support means for eachstator support comprising a pair of arms, one connected to the supportand the other journaled on said assembly for rotational movementsubstantially on said axis, said arms having hubs movably sleeved on thebeam for adjustment lengthwise of the beam and for rotatable adjustmentrelative to the beam, readily releasable means for securing the hubs tothe beam against movement relative thereto, and a readily removable keyextending through openings of the arms of each pair, said key beingdisposed between the beam and the related wheel and extendingapproximately parallel to the beam.

3. In a brake arrangement for a railway car truck having a truck frameresiliently supported from a wheel and axle assembly including an axleand a rotatable Wheel; the combination of an annular rotor housingsecured to the wheel, an annular stator support encircling the axle andextending into the housing, brake means carried by the support andhousing for decelerating the wheel, and support means for the statorsupport comprising a substantially cylindrical beam resilientlyconnected to the frame, spaced arms having hubs sleeved over the beam,said arms receiving the wheel therebetween, said hubs being adjustablelengthwise of the beam and rotatable with respect thereto, readilyreleasable means for securing the hubs to the beam against movementrelative thereto, one of the arms being connected to the stator supportand the other being journaled on said assembly, and a pin approximatelyparallel to the beam extending through complementary openings of saidhubs and disposed between the Wheel and the beam.

4. In a brake arrangement for a railway car truck comprising a wheel andaxle assembly and a truck frame structure resiliently supportedtherefrom; the combination of a beam extending transversely of the truckand having an articulated connection to the frame structure, rotorssecured to spaced Wheels of said assembly, stators associated withrespective rotors, means for frictionally coupling said rotors andstators, a torque arm connected to each stator and having a hub sleevedon said beam, guide arms journaled to said assembly for rotationsubstantially on the axis thereof during relative vertical movement ofthe frame, thereby maintaining concentricity between the rotors andstators, said arms having hubs sleeved on the beam and being adjustablymovable lengthwise of the beam, readily releasable means for securingeach hub to the beam against movement relative thereto, and a pinapproximately parallel to the beam between each wheel and the beam, saidpin being received within complementary openings of the related torqueand guide arms to accommodate relative adjustment therebetween uponrelease of the associated releasable means.

5. In a brake arrangement for a railway car truck having a truck frameresiliently supported from a wheel and axle assembly including an axleand spaced wheels; the combination of a substantially cylindrical beamresiliently connected to the structure, annular rotor housings securedto respective wheels and encircling the axis of said assembly, annularstator supports sleeved within respective housings, brake means carriedby said supports for decelerating said housings, support means for eachstator support comprising a pair of arms, one connected to the supportand the other journaled on said assembly for rotational movementsubstantially on said axis, said arms having hubs sleeved on the beamfor adjustment lengthwise of the beam and for rotatable adjustmentrelative to the beam, readily releasable means for securing each hub tothe beam against movement relative thereto, and pins disposed betweenthe beam and the assembly, each pin being approximately parallel to thebeam and extending through complementary openings in the arms of onepair to accommodate adjustment therebetween lengthwise of the beamwithout removal of said pin.

In a brake arrangement for a railway car truck having a truck framestructure supported by a Wheel and axle assembly including a wheel andan axle; the combination of a stator support member journaled on saidassembly and having spaced upwardly diverging arms extending diagonallyupwardly from. said member, the upper ends of said arms being disposedrespectively at opposite sides of a vertical plane bisecting the axlealong its longitudinal axis, torque lugs on said structure disposed atopposite sides respectively of said plane and engageable with said armsat their upper ends to transmit braking torque to said structure, astator support carried by said arms, a rotor carried by the wheel forrotation therewith, and brake means carried by the stator support fordecelerating the rotor.

7. A brake arrangement as described in claim 6 wherein the arms areprovided with tie rods for connection to corresponding arms of a statorsupport member associated with another wheel of said assembly.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,243,529 Koch Oct. 16, 1917 1,968,583 Apple July 31, 19342,174,395 Aikman Sept. 26, 1939 2,174,399 McCune Sept. 26, 19392,308,890 McCune Jan. 19, 1943 2,382,870 Genssle et al. Aug. 14, 19452,467,356 Eksergian Apr. 12, 1949 2,575,360 Rabinow Nov. 20, 1951FOREIGN PATENTS Number Country Date 485,591 Belgium Nov. 13, 1948 OTHERREFERENCES The Magnetic Fluid Clutch, by Jacob Rabinow, Transactions ofthe AIEE, vol. 67, December 13, 1948, 8 pages.

